HomeFish encyclopediaRay-finned fishesPerch-like fishCardinalfishesHalf-lined cardinal Half-lined cardinal (Apogon semilineatus) Scientific name: Apogon semilineatus Temminck & Schlegel, 1842 The Half-lined cardinal (Apogon semilineatus) is a brackish-water fish of the family Apogonidae. BiologyDorsal spines (total): 8; Dorsal soft rays (total): 9; Anal spines: 2; Anal soft rays: 8. Upper jaw tips of breeding pair protrude. Attains 12 cm TL.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameApogon semilineatusFamilyApogonidae (Cardinalfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length12.0Common length8.0Depth range3–100 m (10–328 ft)EnvironmentMarine; brackish; reef-associated; depth range 3 - 100 mClimateTropicalDistributionWestern Pacific: central Honshu, Japan to Taiwan and the Philippines. Also occurs in Indonesia and northwestern Australia, a new record for the northeastern Indian Ocean.Conservation status (IUCN)Data deficient (DD)Threat to humansHarmlessUsesFisheries: subsistence fisheriesResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026